Matches 51 - 100 out of 104 < 1 2 3 >
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6803815 Amplitude modulation demodulation circuit  
A first automatic phase control (APC) detection circuit generates an APC detection signal having normal polarity from an amplitude modulation signal and APC detection reference signal. A second APC...
6748028 Digital AM demodulator, particularly for demodulating TV signals  
A digital AM demodulator, particularly for demodulating an input signal originating from a tuner, includes a first carrier generator for generating a first carrier signal which is not correlated...
6744827 Demodulator arrangement, method to demodulate, and telecommunication system comprising such a demodulator arrangement  
A demodulator arrangement, suitable to demodulate data symbols modulated in accordance with a predefined constellation diagram and sent as part of information bursts (A 1 , B 1 , C 1 , D 1 , A 2 ,...
6744309 Absolute value amplitude baseband detector  
Amplitude detection of a baseband electrical signal. The detection may be performed by performing full wave rectification on both an in-phase portion of the electrical signal, as on a...
6680985 Adaptive quadrature amplitude modulation decoding system  
An adaptive quadrature amplitude modulation (“QAM”) decoding system for use in, for example, high speed, bandwidth efficient QAM communication systems includes a circuit that adaptively adjusts...
6661849 Multiple payload slicer system with prenormalization integer values  
A network transceiver is configured to receive a complex modulated carrier signal from another network transceiver via a network medium. The complex modulated carrier signal may be payload encoded...
6650875 Transmitter architecture having a secondary phase-error correction loop including an amplitude reconstruction system  
A system for using a translation loop upconverter and power amplifier including a secondary phase-error correction loop uses the output of the upconverter to lock a feedback loop during a time in...
6639459 Demodulator using digital circuitry  
A demodulator converts a voltage input to an output voltage. The demodulator has a voltage-controlled oscillator (VCO), a counter, a holding apparatus, and a digital compare apparatus. The VCO...
6603821 Wireless communication terminal capable of correctly specifying position of burst and having small frequency error of recovered carrier  
A power calculator calculates the power of an input signal in accordance with a component of an input received signal. A comparator asserts an unmodulated signal detection signal when the power...
6574287 Frequency/Phase comparison circuit with gated reference and signal inputs  
Disclosed is a frequency-locked loop (FLL), which attempts to bring about frequency and phase synchronization between two signals over the control bandwidth of the loop: a reference signal and a...
6546055 Carrier offset determination for RF signals having a cyclic prefix  
A method of determining an integral portion of a carrier offset Δf c of an RF signal transmitted from a transmitter at a transmit carrier frequency f ct and an apparatus for carrying out the...
6496549 Method and apparatus for demodulating amplitude-shift keyed data signals  
An approved demodulator is disclosed for demodulating optical ASK data signals whose data bits are each characterized by either an absence of pulses or a burst of pulses at a predetermined...
6480536 Method and apparatus for demodulating and equalizing an AM compatible digital audio broadcast signal  
A method of demodulation and equalization is used to process an amplitude modulated compatible digital broadcasting signal including an amplitude modulated radio frequency signal having a first...
6452977 Method and apparatus for AM compatible digital broadcasting  
A broadcasting method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by: broadcasting an amplitude modulated radio frequency signal...
6426981 Process and device for decoding a radio frequency transmission channel, especially for a terrestrial digital broadcast using OFDM modulation  
The soft decisions associated with the quadrature digital signals received are calculated on the basis of at least one parametric law slaved to the minimum value of the rate of erroneous bits. The...
6418300 Method and device for transmitting mixed analog and digital signals by the same transmitter  
A process for transmitting mixed analog and digital signals. A composite signal is transmitted whose frequency spectrum is composed of a first analog spectrum representative of the amplitude of...
6356594 Data converter  
An analogue to digital or digital to analogue data converter 1 for converting between a first digital signal 101,102 at a first sampling rate f o and a first analogue signal 171,172, ...
6323728 Data carrier for the contactless reception of amplitude-modulated signals  
A data carrier includes at least one coil for the contactless reception of amplitude-modulated signals. A rectifier circuit is connected downstream of the coil. A circuit configuration processes...
6314141 Method for receiving-end automatic identification of a signal at the receiving end, the signal having been transmitted in accordance with the QAM mode, and circuit for carrying out the method  
A method for receiving-end automatic identification of quadrature amplitude modulation (QAM) mode (16-, 64-, 256-QAM; 32-, 128-QAM) of a received signal. The mode having been transmitted in...
6301295 AM modulated wave eliminating circuit  
The present invention provides an AM modulated wave eliminating circuit which is capable of extracting a digital modulated wave by cancelling an AM modulated wave from an AM data multiplex...
6285719 Digital phase sensitive rectification of AC driven transducer signals  
A method and a system for phase sensitive rectification of signals from transducers driven by an AC excitation signal will be disclosed. The method and system demand a very moderate calculation...
6255901 Demodulator for ask-modulated signals having small modulation depth  
A demodulator circuit for demodulating a signal ASK-modulated with modulation pulses equal in duration, and having a small depth of modulation and large dynamic range comprises an amplitude limiter...
6208217 Ask modulator with frequency dependent voltage divider  
An ASK modulator including a switching diode connected in series to a carrier signal transmitting path, a first resistor connected between one end of the switching diode and a digital signal input...
6163570 Methods and apparatus for verifying transmit power levels in a signal point limited transmission system  
A pulse code modulation modem system utilizes the same total average transmit power formula for designing signal point constellations and for verifying that the transmit power of the signal point...
6160856 System for providing amplitude and phase modulation of line signals using delay lines  
A system for amplitude and phase modulation combines digital and analog circuitry for converting digital data into a line signal. Amplitude and phase decoders decode the digital data to determine...
6023614 Method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, particularly for FM signals  
A method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, comprising the steps of: extracting the pilot signal from the modulated signal; obtaining the...
5970046 Apparatus for demodulating AM data multiplexed modulated wave signal  
An apparatus for demodulating an AM data multiplexed modulated wave signal in which an analog modulated signal and digital modulated signals are multiplexed, in order to derive therefrom a baseband...
5956374 Jitter suppressing circuit  
A jitter suppressing circuit is provided for suppressing jitter generated in a multistate quadrature amplitude modulation type modulator or demodulator. Based on I- and Q-phase signals containing...
5949826 Data transmission and reception system  
A data transmission and reception system according to this invention comprises a transmitter for transmitting data by modulating transmit data and a receiver for receiving and demodulating a signal...
5940447 Wireless powered communication device using power signal sampling and method  
A circuit (34) for data recovery in a wireless powered communication device (10) obviates the need for the costly high power consumption filters of prior art devices by deriving a clock signal from...
5936462 AM demodulator using limiter amplifier RSSI output as baseband signal  
An amplitude-modulated carrier signal is demodulated by passage through a limiting amplifier that converts the amplitude-modulated carrier signal to a signal of constant amplitude, and also...
5905761 Amplitude shift keyed receiver  
An amplitude shift keyed (ASK) receiver includes a signal receiving part receiving an amplitude shift keyed signal, a signal detecting part coupled to the signal receiving part and detecting a...
5898732 Data service channel provision for an AM compatible broadcast system  
A service channel is provided for concurrent communication with an amplitude modulated compatible digital broadcast signal. A transmitter receives input program information and input data service...
5825241 Differential demodulator  
A differential demodulator that is particularly suited for a digital audio broadcasting (DAB) system, and more particularly to the Eureka-147 (DAB) system, is disclosed. The differential...
5815035 Demodulating circuit, demodulating apparatus, demodulating method, and modulating/demodulating system of acoustic signals  
A demodulating method wherein the signal can be demodulated accurately even if the S/N ratio is lower by calculating an amplitude peak value by a specific formula from two values of an amplitude of...
5809085 Apparatus and method for detecting and discriminating various signal types in the presence of impulse distortions  
An apparatus and method are provided for a data communications device, such as a modem (100, 101) or facsimile machine, to detect and discriminate various amplitude modulated signals, such as an...
5787116 Apparatus and method for detecting amplitude modulated answer back toned signals  
An apparatus and method are provided for a data communications device, such as a modem (100,101), software modem, or facsimile machine, to detect and discriminate various amplitude modulated...
5774502 Fully integrated data receiver and method for receiving on/off keyed AM/PDSK modulated signals  
A data transmission system in which an on/off keyed (OOK) AM/DPSK modulated data signal with an on/off ratio exceeding about 80 dB which has been modulated on a carrier is received at a compact,...
5652768 Method of and circuit arrangement for demodulating a digital amplitude-modulated carrier signal  
The demodulation of binary amplitude-modulated carrier signals gives rise to special problems, for example in the case of contactless data carriers, because the RF signal is then also used for...
5606576 Adaptive mode control system for AM compatible digital broadcast  
An adaptive mode control system is provided which includes a transmitter including apparatus for inputting format information regarding the waveform structure of an AM compatible digital broadcast...
5602868 Multiple-modulation communication system  
A multiple-modulation communication system includes a transmitter that modulates and transmits communication signals modulated by a first modulation technique and communication signals modulated by...
5532641 ASK demodulator implemented with digital bandpass filter  
Amplitude Shift Keying (ASK) modulation system and method with an ASK demodulator that is implemented with an analog-emulating digital bandpass filter. The bandpass filter also generates a carrier...
5446771 Adaptive coherent signal detection method and apparatus  
A detector (100) determines whether an input signal (10) comprises a first signal or a second signal. A first local signal (207) is generated based on the first signal and a second local signal...
5233634 Automatic gain control circuit in a radio telephone receiver  
An automatic gain control circuit (AGC) in a receiver for a digital radio telephone. Most of the total gain control of the received signal is accomplished in the base band frequency sections, i.e....
5233635 Receiving method and receiver for discrete signals  
The invention relates to an adaptive receiving method and a receiver comprising an adaptive equalizing device for processing a received signal. The receiver further comprises an adaptive detector...
5222144 Digital quadrature radio receiver with two-step processing  
A digital signal processing (DSP) radio receiver employs a conventional analog RF tuner to produce an analog intermediate frequency. The receiver performs DSP functions of digitally sampling the...
5025454 Pulse to zero digital (PZ) modulation  
A "pulse to zero" modulation scheme is taught to transmit binary information by modulating a bit mark onto a carrier at the start of each "0" in the bit stream. The "pulse to zero" decoder produces...
4686484 Phase detection circuit  
A phase detector demodulates a carrier wave which is modulated by a phase shift keying (PSK), a quadrature amplitude modulation, or a similar digital modulated wave. The detector detects the phase...
4639911 Head-end and receiver for a signal distribution system  
Head-end and receiver for a signal distribution system for signals having a wide frequency band and for accompanying signals having a narrow frequency band, such as the video signal and the sound...
4253189 Circuit for recovering the carrier of an amplitude modulated synchronous digital signal  
The present invention comes within the field of synchronous digital transmission. It relates to the recovering the carrier (which may be suppressed carrier) of an amplitude modulated synchronous...
Matches 51 - 100 out of 104 < 1 2 3 >